Water-cooled door-frame.



I L. L. KNOX 6I G. L. DANFORTHI III WATER CUOLED DOOR ERAME. APPLICATION FILED IIINE 2811916.

1,282,861., PIIIIIII-IIII IIIII. 29, IIIIII I I I 4 5 I'J. I 5 @r y l l l 7 z 4 7*@ WITNESSES INVENTORS those of cast material.

Ion one llNlTlE @TrlTlEel PATEN LUTHERL. KNOX, 0F PITTSBURGH, PENNSYLVANIA, AND GEORGE L. DANEOETH, JR., 0F CHICAGG, ILLINOIS, ASSIGNORS TO BLAW-KNOX COMPANY, OF PITTSBURGH, PENNSYLVANIA, Il CORPORATIQN 0F NEW JERSEY.4 l v 'WATER-CQOLEI) DOOR-FRAME.

Maasai..

Specification of Letters Patent.

rateneeaoet. ae, reis.

Application led .Tune 28, 1916. Serial No. 106,495.

To all whom #may concern:

Be it known that We, LUTHER L. KNOX, residing at Pittsburgh,.in the county. of Allegheny and State of Pennsylvania, and GEORGE L. DANroR'rH, Jr., residing at Chicago, in the county of Cook and State of Illinois, both citizens oi the United States, have invented certain new and useful lnr proveinents in Water-Cooled Door-Frames for Heating andMelting Furnaces,.of which the following is a specication.

The present invention has reference to improvements in Water-eooled door frames for heating and melting furnaces, particularly those furnaces Whose operations are at-v tended with unusual hard service and that, therefore, require a door frame constructed to resist the severe `service With the least chance of developing Water leaks through cracks, `seams or rivet holes.

To those familiar With the art it is known that there are now in general use three types of 'Water-cooled door frames: 1st. Those made of cast iron or cast steel, having within and extending being made of east material, are least able of all Water-cooled frames to stand the hard service, for the Walls thereof being exposed side to the cold Water and on the other side to the high temperature of the furnace are subjected to expansion and contraction strains too great for the strength of the material, and after a short service develop cracks and Water leaks that make it necessary to discard the frame. This inherent defect cannot be overcome, for if the Walls lare strengthened by sing made thicker the strains become greater on account of the greater difference in temperature of one side of the Walls compared to the other side. 2nd. Those frames made of rolled steel plates fabricated with rivets. Such frames do not crack as do those made of holes these longer than do 3rd. Those lframes made of rolled steel plates fabricated by Welding together the plates instead of riveting. Such frames are giving goed service and enduring much longer than those previously mentioned, but there are some furnaces Where the operation is unusually secast iron or cast steel, but the rivet very quickly cause water leaks and frames do not endure any down the legs of the traine a space for the cooling Water. Such frames,"

to provide a Water-cooled door frame that can be made at a reasonable cost, fet so sub' stantial in its construction that it- Will sue-y cessfully resist not only the strains of expansion and contraction but also the heaviest punishment from the furnace charging Inav chine.

Figure l is a front elevation o't1 the Water coo ed frame, 'a part being shown in section.

Fig. 2 is a sectional view taken on line II-II of Fig. l.

The water-cooled frame 2 constituting this invention is made of a slab of rolled steel, having substantially the same over-'all di niensions as the iinished door frame. There is then cut ont the door Way 3. This is pref erably done by burning out With a gas torch and then nishing on a cutting machine. The interior of the slab is then removed by drilling out same, thus forming in the frame a chamber or space 4 for containing the cooling water. This drilling is done from the top of the frame and is done by first running the drill down the legs of the frame and then marking out the intervening space into drill spaces that overlap one another, so that the Walls of steel surrounding the cooling water are corrugated and thereby strengthened. Having marked out the drill spaces, alternate ones are first drilled so that the drill iQ entirely surrounded by the steel; then as the remaining spaces are drilled the drill is unsupported on two op posite sides and supported on the remaining sides opposite to one another. In this Way the opposite pressures on the drill are equal and the drill will follow a straight line. Each hole is drilled to a depth measured to leave the desired thickness of steel Wall forming the arch of the doorway. There is then Welded on the open top of the door frame a plate cover 5, having a pipe connection for discharging the Water and a pipe for supplying the Water. This supply pipe has several branches, two extending into the tivo legs of the frame and at least one to Las supply cold water to the arch of the door- Way. rll`he water from the legs and that from the arch circulate upward to the discharge pipe.

lit can be seen that in this way there is provided a door frame of very. heavy and rigid construction, the walls of which are of rolled steel and corrugated by the drilling processi also, those walls exposed to the service are absolutely seamless, the entire frame being so except at the top where there is only the water pressure to withstand.

AAt the bottom of each leg there is provided an extension or foot 6 by means of which the frame is fastened down to the fore plate, and there are also provided the independent check plates of rolled or cast steel that are placed in front of the door frame and attach to the furnace buckstaves,

thus holding the frame from this side while the furnace bottom, brick Walls and roof channel hold it from the opposite side.

Any suitable means may be provided for maintaining a circulation of water within the frame. For this purpose we have shown the circulating pipes 7 having legs 7n which extend downwardly into the water space at each side of the door opening.

Having described 4the invention, its ufacture and usefulness, what we claim as y novel is.:

l. As a new article of manufacture, a

'chambered furnace door frame made from man' aci

a rolled steel *slab said frame having plane outer surfaces and corrugated walls `within the chamber, substantially as described.

2. As a new article of manufacture, a chainbered furnace door frame made from a rolled steel slab, and having a doorway therethrough with legs at each side of the doorway extending downwardlyfrom the.

doorway extending downwardly from they bottom of the frame, said frame h ving plane outer surfaces and corrugated walls within the chamber, and a cover secured to the upper end of said door-frame and forni"- ing a closure for the chamber, substantially as described. f i f In testimony whereof, lwe have hereunto set our hands. 1

LUTHER L: KNOX. GEORGE L. KDANFORTH, JR.

Witnesses:

L. K. JOHNSON, H, M. CoRwIN. 

